Hi, for post graduation you can go for M.Phil. in Economics. You should weigh your options and select what degree you really want to pursue.  For universities in England you will have to give IELTS exam. But, you can wait before giving the exams most of the times the exam is waved off. GPA should be anything above 7 preferably. You don't need anything else for your masters. Documents required will be all your 10th, 12th marksheet and other qualification marksheet, Passport, Updated resume, 2 LORs, and SOP. It is recommended that you consult a good counselor first before applying. If you still have doubts you can freely comment back here, Hope this helps. All the best!